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4 Stroke Bicycle Engines & Kits 4 stroke motorized bicycle engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

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Old 03-09-2013, 05:03 AM
beginner01 beginner01 is offline
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Default What carb for B&S 3.5hp?

So I have a Briggs & Stratton 3.5hp motor with a carb attached to the tank below. There is a tube that goes straight down from the carb into the tank. This is the carb:
http://www.amazon.com/498298-Briggs-...ggs+carburetor

Can I use this carb with a frame-mounted gas tank above the motor? if not, what kind of carb would I need to get?

edit: here is the bike as it sits now. The tank will be going up on the top tube.



Last edited by beginner01; 03-09-2013 at 06:46 AM.
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Old 03-22-2013, 08:36 PM
tigmaster tigmaster is offline
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Default Re: What carb for B&S 3.5hp?

The carb You have can only be used with the stock tank,so I would say You should find a small motorcycle carb and fab up a manifold to fit....Tigmaster....
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Old 03-23-2013, 12:19 AM
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Default Re: What carb for B&S 3.5hp?

I have had great results on these engines using a Honda minibike carb. The smaller 50cc bikes make the best donors. You will need to fab a manifold to use the bike carb. Much better throttle response and overall power. Classic old school gokart hot rodding trick.
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Last edited by maniac57; 03-23-2013 at 12:20 AM. Reason: spelling (DOH!)
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Old 03-23-2013, 08:21 AM
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Default Re: What carb for B&S 3.5hp?

If you've got a couple bucks, the little NT carburetor's that come with the china 2 stroke kits work amazingly on 3hp briggs' all you need for a manifold is to get a piece of 16 gauge 3/4 inch tubing. Fits rite in the back of the carb

Ccd
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Old 03-23-2013, 03:22 PM
livesteamfan livesteamfan is offline
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Default Re: What carb for B&S 3.5hp?

Actually, on the vertical shaft Briggs engines you find on newer mowers have what you need. They have a manifold with a 90 degree bend that will make the carburetor inlet face the front (pull start side) of the engine and the carburetor should on that should work as well. You may just have to adjust it some because when I tried it I couldn't take the choke off, but then again it had been sitting for a couple years. Check local mower shops to see if they have a graveyard you could wander through. The manifold looks like this: http://www.ebay.com/itm/BRIGGS-AND-S...404#vi-content

and the carb is like this: http://www.mfgsupply.com/22-14111-br...FQrNnAodCQMAvA
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Old 03-23-2013, 08:34 PM
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Default Re: What carb for B&S 3.5hp?

Quote:
Originally Posted by charliechaindrive. View Post
If you've got a couple bucks, the little NT carburetor's that come with the china 2 stroke kits work amazingly on 3hp briggs' all you need for a manifold is to get a piece of 16 gauge 3/4 inch tubing. Fits rite in the back of the carb

Ccd
This is a great cheaper alternative to a japanese carb. The briggs style carbs are designed to run at one steady rpm, you get much better useable power with a motorcycle style carb than one designed for a cement mixer...
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Old 03-23-2013, 08:58 PM
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Default Re: What carb for B&S 3.5hp?

That's a diaphragm carb, this is the other type carb that came on Briggs of that same size http://outdoorpowerinfo.com/repairs/...ce_flo-jet.asp. Which can be used on your motor for a stock look. I have one with a 90 degree manifold that will work, you'd need to give it a going through.
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Old 03-24-2013, 08:32 AM
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Default Re: What carb for B&S 3.5hp?

http://motorbicycling.com/attachment...4&d=1357992317
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Old 03-24-2013, 05:35 PM
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Default Re: What carb for B&S 3.5hp?

Quote:
Originally Posted by chainmaker View Post
Sounds good. I just ordered a minibike carburetor from Ebay for cheap. It will arrive in a few days. I am going to try to make something from plumbing tubing and machine some steel flanges at work.

I'll keep you posted!
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